I have maybe a stupid qeustion but i will asking anyhow :
Is it possible that a analog amplifier (4-20 mA/24 V DC) connected on a 3 or 4 wire PT100 will behave not linear while the PT100 (measuring range 0-150 C°)is good functioning ?
I want to know if calibrating at 3 points (0-75-150 C°) is neccerary when calibrating at one point is enough when you check the whole loop.
The PT100 is always linear but i want to calibrate with amplifier and i am curious if the amplifier is acting always linear between 4-20 mA when i calibrate.
I see a amplifier only as a simple converter from resistance to mA ?